Add Tokio tutorial

Closes: #1377

Author: Darksonn

draft/2020-07-28-this-week-in-rust.md

@@ -18,6 +18,8 @@ Check out [this week's *This Week in Rust Podcast*](https://rustacean-station.or
 
 ## News & Blog Posts
 
+* [Tutorial for Tokio and async Rust](https://tokio.rs/tokio/tutorial)
+
 # Crate of the Week
 
 This week's crate is [pre](https://github.com/aticu/pre), a library for declaring and checking the assurance of precondition, useful for unsafe functions.